JP2612632C - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]   The present invention relates to recording and / or reproducing information on a recording medium such as an optical disk.
The recording apparatus, especially if information is recorded by different recording methods.
The present invention relates to an applicable information recording / reproducing device. [Conventional technology]   A large amount of information such as image data, image data, code data, etc. is stored at high speed,
As a means for searching, various file memories are used for computers.
I have.   As this kind of file memory, optical disk files have large capacity, portability, etc.
It has the following characteristics, and has recently been noticed and expected.   On the other hand, laptop personal computers, one of small personal devices,
It is assumed that a portable device is portable, so its storage device must be resistant to vibration.
In addition, the portability of the media is strongly required.   In contrast, optical disk files, which are large-capacity versions of floppy disk drives,
Satisfies the demand. Then, from the requirement of portability, for example, rewriting
Work for standardizing optical discs (magneto-optical discs) is proceeding at the International Organization for Standardization
I have.   By the way, in order to improve the storage capacity and data transfer speed of optical disc files
First, improvement in linear recording density can be considered. To increase the linear recording density,
There are improvements in recording methods, miniaturization of recording laser spots, and the like.   Conventionally, as a recording method generally used in an optical disc, a recording medium
Physical change state formed on the surface, for example, spots such as pits and magnetic domains
One of the components of a code that describes information at the center position of the change state of, for example, There is a so-called pit position (spot) recording method that corresponds to "1".   On the other hand, as a recording method for improving the linear density recording, the physical change state
Information is described at the transition boundary position, that is, the position of the leading edge and the trailing edge of the transition state.
A so-called pit edge (width) recording method, in which one of the components of the code corresponds, is proposed.
Is being planned.   FIG. 14 shows pit position recording (spot recording) which is a typical recording method.
And the principle of pit edge recording (width recording).   In the figure, the code data is as follows.   “1001001001”   In the pit position recording method, a pit is set at the position where "1" exists.
Information is recorded at the center of the pit.   On the other hand, in pit edge recording, a pit exists (or does not exist) at a position where "1" exists.
) Changes from the state without pit (or with) to the pit position.
In pit recording, information is recorded at the center of the pit.
Information is recorded at the positions of both edges of the oval pit. As a result, pit edge recording
Thus, a higher linear recording density can be achieved as compared with pit position recording.   By the way, in the above-mentioned optical disk device, the rotation speed of the optical disk has been kept constant until now.
And a method to keep the recording frequency and reproduction frequency constant regardless of the access position is adopted.
I was This method is called CAV (Constant Angular Velocity) method.   On the other hand, a new recording method was proposed to increase the capacity and started to be put to practical use.
I have. That is, the rotation speed of the optical disk is kept constant, and the recording
The wave number and the reproduction frequency are switched to realize a large capacity. This method is called MCA
It is called V (Modified Constant Angular Velocity) method.   In the conventional CAV method, the recording density on the outer circumference of the optical disc is lower than that on the inner circumference.
On the other hand, in the MCAV system, the recording density is generally almost the same at the inner and outer circumferences.
The same. [Problems to be solved by the invention]   By the way, recently, in order to increase the recording capacity, the pit position recording type MCA
Information recording / reproducing device that adopts V method and CAV method of pit edge recording method Is being developed.   On the other hand, as described above, the rewritable
Standardization standards for optical disks and the like have been established. From the standardization standard, the recording method is
The pit position recording method is mainly the CAV method.   However, to achieve high-density and large-capacity recording, the pit position recording method must be used.
The pit edge recording method is preferable, and the MCAV method is more preferable than the CAV method.
Good. Therefore, in the future, the MCAV method will be replaced by the pit edge recording method with high density and large capacity.
It is considered to be employed for recording.   Therefore, in the future, for optical disk devices, for example,
Various methods such as CAV method of the formula, MCAV method of the pit edge recording method, etc.
Will coexist.   However, the information recording / reproducing apparatus using the conventional pit position recording method is of course
Even in the case of large-capacity information recording / reproducing devices currently being developed,
There is a problem that compatibility with other recording methods is not considered at all
.   For this reason, an information recording / reproducing apparatus using one method requires a recording medium using the other method.
Incompatibility of recording media, inability to read information recorded on the body
Is considered to occur.   It is possible to equip each type of information recording / reproducing device,
It is necessary to equip extra equipment, which puts a heavy burden on the user,
Not good. Also, relatively small information, such as a laptop computer
In the case of a processing device, it is contrary to the purpose of miniaturization to provide a recording / reproducing device of each type.
And it is hard to adopt.   Further, the user can change the recording method of the information managed by the user to one of the methods, for example,
When trying to unify to the MCAV system in the pit edge recording system,
A problem arises in handling information recorded by the CAV method in the position recording method.
It will be.   Therefore, it is necessary to develop compatible information recording / reproducing devices for both systems.
However, this is a new problem in the optical disk device. This is a playback-only device, It is considered that the same applies to a recording-only device. In addition, the pin located between
CAV method of edge recording method and MCAV method of pit position recording method
It is considered necessary to deal with   An object of the present invention is to provide a pit position recording method, a pit edge recording method,
At least two of the combinations with the AV system and MCAV system
Information can be recorded by either method,
Information reproducing apparatus and information recording apparatus capable of reproducing information even when recording by the method of
Device and an information recording / reproducing device. [Means for solving the problem]   In order to achieve the above object, the present invention providesMedium rotating means for rotating a recording medium;
Reproducing head for detecting recording information from a recording medium, a spot recording method,
Either of the width recording methods and either the CAV method or the MCAV method
Among the recording methods that are combined with one of the methods, the width recording method and the MCAV method
And the combination of spot recording and CAV
For the recording information recorded by the recording method comprising
With a function that can perform playback corresponding to each recording system consisting of
Circuit and the identification information given from the outside or the identification information detected from the recording medium.
Based on the above, the reproducing circuit selects a recording method composed of the combination to be reproduced.
And a control circuit having a selection function.
The detection signal is reproduced according to the method selected by the control circuit.information
A playback device is provided.   Also, the present inventionMedium rotating means for rotating a recording medium, and information on the recording medium;
The recording head for recording information and the generation of recording information to be written on the recording medium are scanned.
One of the pot recording method and the width recording method, and the CAV method and M
Of the recording methods that are combined with either one of the CAV methods,
Recording method consisting of a combination of recording method and MCAV method, and spot recording method
For each of the recording systems consisting of a combination of the CAV system and the CAV system
A recording information generation circuit having a function and an identification information or a recording medium given from outside.
Based on the identification information detected by the A selection function for selecting the recording method consisting of the above combination to be used for generating
The recording information generating circuit includes a recording circuit to be written on the recording medium.
The recording information is generated according to the method selected by the control circuit. Information recording device
I will provide a.   Further, the present invention providesMedium rotating means for rotating and driving the recording medium;
Recording / reproducing head for recording / reproducing information, spot recording method and width recording
System, and either one of the CAV system and the MCAV system.
Of the width recording method and MCAV method
Combination of spot recording method and CAV method
For the recording information recorded by the recording method consisting of
A reproduction circuit having a function of performing reproduction corresponding to each recording method;
The generation of recording information to be written on the recording medium is performed by the spot recording method and the width recording method.
Either of the above methods and one of the CAV method and the MCAV method
Combination of the width recording method and MCAV method among the recording methods
Recording system, and the combination of spot recording system and CAV system
A recording information generation circuit having a function to perform each recording method,
Based on the identification information given by the
A recording method comprising the combination to be reproduced by the recording / reproducing circuit and a recording information generation circuit.
The path selects a recording method consisting of the combination to be used for generating recording information.
A control circuit having a selection function, wherein the reproducing circuit detects a signal from the reproducing head.
The output signal is reproduced according to the method selected by the control circuit.
The recording information generation circuit controls the generation of the recording information to be written on the recording medium by the control circuit.
Perform according to the method selected by the roadAn information recording / reproducing device is provided.   The reproducing circuit includes, for example, a leading edge and a trailing edge of a signal pulse read from a recording medium.
Edges are detected, and if width recording is selected, the leading and trailing edges are used to
If pot recording is selected, use either the leading or trailing edge to
It has a function to reproduce data.   According to the present invention, the data reproduced by the reproduction circuit is temporarily stored, and then, This data is recorded by the recording information generation circuit in a recording method different from that used during reproduction.
It is also possible to realize an information recording / reproducing apparatus having a function of converting information into information. [Action]   The present inventionThere are two spot recording methods: CAV method and MCAV method for width recording method.
seedBy being able to reproduce, the recording system of the recorded data,S
CAV method of pot recording method and MCAV method of width recording methodOne of the obvious
In this case, the reproducing method is instructed to the apparatus by specifying identification information indicating the recording method.
Can be selected.   If it is not clear, playback from a specific track provided on the recording medium
The recording method is determined based on the data, and the data is reproduced according to the corresponding recording method.
Make raw or record. As a result, the recording method can be automatically detected and recorded.
When playing back a recording medium, the user does not need to be aware
Recording / reproduction can be performed.   Therefore, according to the present invention, the pit position recording method CAV method,
Even when different recording methods coexist, such as the MCAV method of
One device can handle it and ensure device compatibility with recording media
Can be. [Example]   Hereinafter, embodiments of the present invention will be described with reference to the drawings.   In each of the following embodiments, an example of an information recording / reproducing apparatus will be described.
By omitting unnecessary functions for each information reproducing device,
The configuration can be the same as that of the embodiment. In the following example, the pit position
The following shows an example of using the pit recording method and the pit edge recording method.
Pits, such as when using a recording medium that records information according to
The present invention can be applied to a spot recording method or a width recording method which is not limited.   In each embodiment, the same reference numerals are used for the same or common components.
To avoid duplication of explanation.   FIG. 1 shows an information recording / reproducing apparatus of the present invention applied to an optical disk file apparatus.
1 shows a configuration of an embodiment.   The information recording / reproducing apparatus of the embodiment shown in FIG.
A spindle motor 22 that functions as a
Optical head 5 for reproducing and reproducing, and generation of information to be written by the optical head 5
A recording information generating circuit 1a for generating information and a detection signal from the head 5;
A reproducing circuit 1b for performing reproduction, and a spindle motor for rotating the recording medium 26;
The optical head 5 to the target access position and the drive control circuit 1e for driving the
Head for driving the actuator 19 for performing
Access control circuit 1d, these recording information generation circuit 1a, reproduction circuit 1b,
Of the entire apparatus including the operation control of the read access control circuit 1d and the drive control circuit 1e.
And a control circuit 1c for performing control.   The optical head 5 is appropriately selected according to the properties of the target recording medium. This optical head
The disk 5 has both functions of a recording head and a reproducing head, and for example, as a light beam source
, An optical system, a driving device for the optical system, and the like. Mochi
Of course, the present invention is not limited to this, and rewritable recording media such as magneto-optical
An optical head applicable to a disk or the like can be used.   Here, in order to achieve two types of recording methods, for example, large capacity and high speed
Pit edge recording method to achieve device compatibility with MCAV method
The major circuits for the CAV system in the session recording system are described below.
I will tell.   The recording information generation circuit 1a detects from identification information given from outside or from a recording medium.
Based on the identified identification information, the pit edge recording method uses the MCAV method and the pit point recording method.
Generates recording information by selecting one of the CAV methods in the session recording method.
. The recording information generating circuit 1a converts the write data into a code consisting of (2, 7) codes.
(2,7) code conversion circuit 10 for converting into a column and (2,7) code conversion circuit 10
A write clock generation circuit 11 for supplying a write clock;
A write pulse generating circuit 12 for generating a write pulse from the
A laser driver 13 for driving the optical head 5 by a write pulse from
A line for switching the current applied to the laser driver 13 according to the access position.
And a power switching circuit 18.   In the case of the pit edge recording method and the MCAV method, writing is performed according to the access position.
Drive MPU (micro processor) to switch frequency and write power
The write clock generation circuit 11 and the write unit
It is provided to the power switching circuit 18. On the other hand, CAV
In the case of the formula, the writing frequency is constant regardless of the access position. In addition, light
The word may be switched according to the access position.   The reproduction circuit 1b detects identification information given from outside or is detected from a recording medium.
Based on the identification information, MCAV method and pit position
The detection signal is reproduced by selecting one of the CAV methods as the recording method.
The reproducing circuit 1b amplifies the detection signal from the optical head 5 and also outputs information.
A preamplifier 6 for extracting a signal necessary for reproduction and a waveform of a detected original signal are shaped.
Clock from a phase synchronized with the shaped signal
The phase-locked loop 8 converts the waveform-shaped signal from the (2, 7) code to NRZ data.
(2, 7) code demodulation circuit 9 and an identification information detection circuit 14.
You.   In the case of the pit edge recording method and the MCAV method, the reproduction frequency depends on the access position.
In order to switch the number, the zone information is sent from the drive control MPU 17 to the phase synchronization circuit 8.
give. On the other hand, if the pit position recording method is the CAV method,
Regardless, the reproduction frequency is constant.   The head access control circuit 1d is for moving the optical head 5 to the access position.
The seek control circuit 21 and the tracking and focus control of the optical system.
And a racking focus control circuit 20.   The drive control circuit 1e detects the number of rotations to rotate the recording medium 26 at a constant speed.
It comprises a circuit 23, a rotation speed control circuit 24 and a drive circuit 25.   The number of rotations of the spindle motor 22 is set in the case of the pit edge recording method and the MCAV method.
The same or different pit position recording method and CAV method
May be. Here, the pit position recording method conforms to the ISO standard.
 1800 rpm, pit edge recording method, to achieve higher data transfer speed
In this case, it is desirable that the speed be 1800 rpm or more.   The control circuit 1c includes a host computer not shown (hereinafter abbreviated as host).
SCSI (Small Computer System Int.) That exchanges data between
controller), a buffer memory 2 for temporarily storing data,
A buffer controller 3 for controlling the input and output of data to and from the buffer memory 2,
A disk controller 4 for controlling recording / reproduction of data, and a function of this controller
A controller control MPU 16, a recording information generation circuit 1a, a reproduction circuit 1b,
Drive control MP for causing head access control circuit 1d and drive control circuit 1e to function
U17.   FIG. 2A shows a write clock generation circuit 11 and a write clock generation circuit 11 which constitute the recording information generation circuit 1a.
And an example of the write power switching circuit 18.   The write clock generation circuit 11 includes a reference clock generator 11a, an N frequency divider 11b
, Phase frequency comparator 11c, charge pump 11d, loop filter 11e,
Pressure control oscillator 11f, variable M frequency divider 11g, frequency division ratio setting circuit 11h, center frequency
The switching circuit 11i is provided.   The variable M frequency divider 11g divides the frequency by the drive control MPU 17 according to the identification information.
The frequency division ratio is set via the ratio setting circuit 11h. Here, the dividing ratio setting circuit 11h
Can be composed of, for example, a three-state bus buffer and a flip-flop.
The frequency division ratio can be set according to the access position.   Further, the center frequency switching circuit 11i is provided with a circuit loss of the PLL including the voltage controlled oscillator.
The center frequency and gain are switched to prevent loss.
The switch SW11a and the resistors R11a and R11b can be easily configured. Here,
Two center frequencies and gains are obtained by turning on and off the analog switch SW11a.
Can be In the case of the MCAV method, the center frequency is lower on the inner circumference side than on the outer circumference side.
.   The write power switching circuit 18 includes a write power setting circuit 18a, the D / A converter 1
8b or the like. The write power setting circuit 18a sets the frequency division ratio.
It can be configured with a circuit similar to the circuit 11h.   FIG. 3A shows an embodiment of the waveform shaping circuit 7 of the reproducing circuit 1b.   The waveform shaping circuit 7 includes a differentiator 7a, an AGC (automatic control gain) amplifier 7b, A gate generation circuit 7c, a differentiator 7d, a pulse generation circuit 7e, and a filter setting circuit
Path 7f, low-pass filter LPF (1) 7g, low-pass filter (2) 7h,
It is configured to include the analog switches SW7a to SW7e.   Low-pass filters with different cutoff frequencies to support MCAV system
LPFs 7g and 7h can be selected according to the access position. Here, for example, two
Although the LPF has been described, the number of LPFs is not limited to two.   The identification information detection circuit 14 is a low-pass circuit including a resistor R14 and a capacitor C14.
A filter 14a, a comparator 14b, and an output voltage of the AGC amplifier 7b.
Identification information for comparing with the reference voltage V2 and identifying the pit position recording method
Is detected.   FIG. 3B is a waveform diagram of a read signal in the pit position recording method. 3rd C
The figure shows a waveform diagram of a read signal in the pit edge recording method.   FIG. 4 is an operation timing chart for explaining a conventional phase locked loop circuit (not shown).
It is a chart.   In response to the read pulse, the VCO clock enters the phase comparator at the timing shown in the figure.
When activated, the phase comparator outputs an INC signal and a DEC signal. INC signal
Becomes low level by the rising edge of the read pulse, and the falling edge of the VCO clock
It changes to high level by the edge. On the other hand, the DEC signal depends on the data transfer rate.
This corresponds to a read pulse having a given pulse width. The read pulse uses a delay line
Generate. In accordance with the INC signal and the DEC signal, the charge current and the discharge current
Charge current is output. Note that the phase synchronization period, that is, the normal gain period
During the phase pull-in period, that is, the high gain period, the charge current and discharge
The magnitude of the charging current differs.   To apply this phase-locked loop to the MCAV method, the data must be set according to the access position.
Data transfer speed, it is necessary to set the read pulse width step by step.
You. That is, many delay lines are required to set the read pulse width,
This is a major problem from the standpoint of board mounting.   FIG. 5 shows an internal circuit configuration of an embodiment of the phase locked loop 8 suitable for the present invention,
The operation of the phase synchronization circuit 8 will be described with reference to FIG.   The phase synchronization circuit 8 includes a frequency phase comparator 8a, a charge pump 8b, a loop
Filter 8c, voltage controlled oscillator 8d, phase comparator 8e, T / I converter 8f
, And a center frequency switching circuit 8g.   In this embodiment, the frequency-phase comparator 8a and the phase ratio
And the comparator 8e. Also, the center frequency and gain of the voltage controlled oscillator 8d
Can be realized in the same manner as in the write clock generation circuit 11 described above.
. Here, for example, an analog switch SW8 and resistors R8a and R8b are provided.
It is composed. In order to optimize the PLL system, the charge pump 8b
Set the gain according to the access position.   During the high gain period, the phase locked loop circuit 8 performs a high-speed pull-in operation.
Loop gain is set higher than the normal gain period. When comparing the frequency and phase,
The gain state is set, and the normal gain state is set at the time of phase comparison. Also lead
When the enable signal is in the disabled state, the VCO clock is the write clock.
The speed of following the read pulse when the state changes is increased compared to
.   FIG. 7 shows the circuit configuration of the frequency / phase comparator 8a, and FIG.
4 shows an operation timing chart of the comparator 8a.   The frequency / phase comparator 8a includes flip-flops 17a-1 to 17a-3,
Circuit 8a-4, a NAND gate 8a-5, and an AND gate 8a-6
It is composed. The (2, 7) sign-in data pattern is 1000100010 ...
Therefore, here, the divide-by-4 circuit 8a-4 is used.   The INC signal becomes high level at the rising edge of the read pulse, and is divided by 4 divided VC.
The state changes to low level at the rising edge of the O clock. The DEC signal is
High level at rising edge of VCO clock divided by 4 and rising of read pulse
Changes to low level. Therefore, in this system, the MCAV system
There is no need to set the width of the read pulse according to the access position.   FIG. 9 shows a circuit configuration of the phase comparator 8e, and FIG. 10 shows a circuit of the T / I converter 8f.
FIG. 11 shows the operation timing of the phase comparator 8e and the T / I converter 8f.
3 shows a chart.   The phase comparator 8e includes flip-flops 8e-1 to 8e-4 and an AND gate 8
e-5 to 8e-7 and inverter gates 8e-8 and 8e-9.
You.   The output Tc of the AND gate 8e-5 is output immediately after the rising edge of the read pulse.
It is at the high level until the rising edge of the subsequent VCO clock. AND gate
From the falling edge to the rising edge of the VCO clock immediately after the output Ts of 8e-6
Becomes a high level for a half cycle. The output Td of the AND gate 8e-7 is Vd immediately after Ts.
It becomes a high level for a half cycle from the rising edge to the falling edge of the CO clock.   The T / I converter 8f shown in FIG.
Current sources 8f-4 and 8f-6, variable current sources 8f-3 and 8f-5, and switches
Switches SW8a and SW8b, an inverter 8f-1, and an inverter 8f-1.
And a switch S constituting a sample-and-hold circuit,
W8b and a capacitor C8b, and the variable
And an operational amplifier 8f-2 for controlling output currents of the flow sources 8f-3 and 8f-5.
It is composed.   The T / I converter 8f operates to convert a phase error (time) into a current value.
.   The charge current ITC is extracted from the capacitor C8a by the Tc signal, and the voltage of Vc1 is
Rises. Next, the voltage of Vc1 is sampled to the capacitor C8b by the Ts signal.
Is A current ITD is generated according to the sample and hold voltage Vc2, and Td is generated.
 The discharge current ITD is supplied to the capacitor C8a by a signal to
The state returns to the state, and the position comparison operation for one cycle ends.   The charge currents ITC and ID are constant currents set by the resistor R8, and are equal to ITD and ID.
And IC are variable currents that vary according to Vc2. Therefore, the output current ID is
It is determined by the difference between Ic and Id. In case of T / I conversion method, rise of read pulse
Since only the edge is required, it can be easily adapted to the MCAV method.
.   FIG. 12 shows a circuit configuration of the rotation speed detection circuit 23 and the rotation speed control circuit 24. You.   The rotation number detection circuit 23 includes a rotation detector 23a such as a Hall element and a pulse generation circuit.
23b. The rotation speed control circuit 24 includes an N frequency divider 24a and
, A reference clock generator 24b, a variable M frequency divider 24c, a speed comparator 24d,
It comprises an integrator 24e and a frequency division ratio setting circuit 24f. The division ratio setting times
The path 24f can be constituted by, for example, a three-state buffer and a latch circuit.   By changing the frequency division ratio of the variable M frequency divider 24c, the number of revolutions of the spindle motor can be changed.
It can be set at will. Here, the frequency division ratio setting circuit 2 from the drive control MPU 17
The frequency division ratio of the variable M frequency divider 24c is set via 4f according to the recording method.   In such a configuration, as shown in FIG. 1, writing from a host (not shown) is performed.
The writing information is stored in the buffer memory 2 via the SCSI controller 15.
You. The data stored in the buffer memory 2 is transmitted to the buffer controller 3
, And write control is performed by the disk controller 4.
2, 7) sent to the code modulation circuit 10. Write data is (2,7) code modulation
The circuit 10 converts the NRZ data into (2,7) code data.   The (2,7) code data from the (2,7) code modulation circuit 10 is a write pulse generator.
Write driving of the optical head 5 by the laser driver 13 via the circuit 12
Then, the data is written on the optical disk medium 26.   On the other hand, when reproducing information written on the optical disc medium 26, the optical head
The read signal from the node 5 is amplified by the preamplifier 6, and the waveform shaping circuit 7
The signal is sent to the (2,7) code demodulation circuit via the phase synchronization circuit 8. And (2,7)
The code read data is converted by the (2, 7) code demodulation circuit 9 into the NRZ read data.
The data is converted into data and read-controlled by the disk controller 4. Disco
The data read by the controller 4 is stored in the buffer memory 2 and the SCSI controller.
It is sent to the host via the controller 15.   Here, the read signal from the optical head 5 is amplified by the preamplifier 6 and
Output (6-P, 6-N). The original reproduction signal of the signal output 6-P is the third reproduction signal. As shown in FIG. B and FIG. 3C.   Next, when recording and reproducing data using the information recording / reproducing apparatus described above,
An example of such a case will be described.   First, FIGS. 1 to 3C show an embodiment in which the recording method is known in advance.
It will be described with reference to FIG.   If the identification method is already known for the recording medium to be used, the above-described device is used.
In the device, identification information indicating which recording method is used is indicated by a keyboard or a switch (not shown).
The data is input to the apparatus of this embodiment by a switch or other means. Compatible with input of this information
Then, the drive control MPU 17 outputs the identification control information, whereby the waveform
In the circuit 7, the switches SW7a and SW7b select the output of the differentiator 7a.
This is input to the AGC amplifier 7b. And in case of pit position recording method
The switch SW7e is turned off according to the identification information. In contrast, pit edges
In the case of the digital recording method, the switch SW7e is turned on.   Explanation on reproducing information recorded by pit position recording method
I do.   The original reproduced signal 6-P (negative phase 6-N) is differentiated by the differentiator 7a, and the first-order differentiated reproduced signal is obtained.
The signals 7a-P and 7a-N are input to the AGC amplifier 7b. That is, the pit position
The signal is differentiated for detection, and the signal is converted to a constant signal amplitude VPP by the AGC amplifier 7b.
To hold. The first-order differential reproduction signals 7b-P and 7b-N are transmitted to the next-stage gate generation circuit.
Path 7c, input to the differentiator 7d, gate signals 7c-P, 7c-N, and second-order differentiation
The reproduction signals 7d-P and 7d-N are generated.   The gate signal has a large amplitude level of the first derivative reproduction signal with respect to the gate generation level.
Generated by small. In the pit position recording method, switch SW7e is turned off.
Therefore, the gate signal 7c-N is not input to the pulse generation circuit 7f
.   The read pulse signal is such that the gate signal 7c-P is at a high level and
Generated only when the raw signal is at zero level.   As described above with reference to FIGS. 3A and 3B, recording pits and lead pallets
The read pulse signal is associated with the phase synchronization circuit 8 at the subsequent stage. (See FIG. 1). In the phase synchronization circuit 8, the read pulse signal
A phase-synchronized clock is generated, and a (2,7) code demodulation circuit is generated using the clock.
At 9, the data is converted into NRZ read data and sent to the disk controller 4.   On the other hand, when reproducing information recorded by the pit edge recording method,
The switch SW7e is turned on, and each signal is as shown in FIG. 3C.   The gate signals 7c-P and 7c-N are both valid and input to the pulse generation circuit 7f.
Is forced. Therefore, the read pulse signal includes the gate signal 7c-P or 7c-N.
During high level, the second derivative reproduction signal is generated at the position crossing zero level
.   Next, a case where information is written to an optical disk medium will be described.   When recording by the pit position recording method, the output of the (2,7) code modulation circuit 10
The (2, 7) code write data, which is the power, is written by the timing circuit 12a.
Synchronization is achieved by the clock from the clock generation circuit 11. This write synchronization data
The delay is performed by the delay circuit 12e for a desired constant time. This delayed write synchronization data
And the write synchronization data in the constant pulse width generator 12c.
Thus, a write pulse is obtained. This signal is applied to the laser driver 13 and
Information recording is performed by the optical head 5.   On the other hand, when recording is performed by the pit edge recording method, the write synchronization data is
The frequency is divided by 2b to generate a write pulse. When the write pulse is high level
The laser driver 13 turns on to form a pit.   According to the identification information indicating the recording method, the output of the frequency divider 12b or the
Selects the output of the constant pulse width generator 12c.   Next, an example in which the recording method of the optical disk on which information is recorded is unknown.
Will be described.   In this embodiment, the recording method is determined from the identification information recorded on the identification-only track.
Is what you do. The equipment used is the same as that shown in FIGS. 1 and 2A.
The same.   First, according to the identification control information, the switch SW7a is turned on, and the preamplifier output 6-
P, 6-N are selected and input to the AGC amplifier 7b. On the other hand, differentiator 7a output Is shut off by turning off the switch SW7b. AGC amplifier that is a playback signal
The signal amplitude Vpp of the outputs 7b-P and 7b-N is kept constant as shown in FIG. 3D.
Dripping.   Part of the output of the AGC amplifier 7b is sent to the identification information detection circuit 14. here
, An average voltage by a low-pass filter including a resistor R14 and a capacitor C14.
VX is created. By inputting this DC voltage to the comparator 14b, the detection is performed.
Get outgoing identification information. The recorded code data is “1000100
The present invention is not limited to 0 ", and may be any repetition of the same pattern.   In the case of the pit position recording method, in this circuit configuration, the detection identification information is high.
Level, and low level in pit edge recording. In the former case, VX
Is higher than VPP / 2. In the latter case, VX is about VPP / 2.
, The comparison voltage V2 of the comparator is higher than VPP / 2 and the pit position recording method
Set lower than VX in the equation. As a result, the detection identification information becomes as described above, and is recorded.
The method can be easily determined.   Thereafter, in order to reproduce the information, the switch SW is operated in accordance with the identification control information and the identification information.
7a and SW7b select the output of the differentiator 7a, and at the same time, switch SW7e.
Select or deselect 7c-N which is the output of the gate generation circuit 7c.   Next, a description will be given of a second embodiment of the information recording / reproducing apparatus according to the present invention.   In the present embodiment, the pit position recording method is the (2, 7) code for the CAV method.
And (1,7) code for the pit edge recording method and MCAV method
This is an example.   The basic configuration of the information recording / reproducing apparatus of this embodiment is shown in FIG.
This is the same as the embodiment shown. That is, as shown in FIG.
1a, a reproduction circuit 1b, a control circuit 1c, a drive control circuit 1e, and
Head access control circuit 1d, optical head 5, actuator 19 and spin
A dollar motor 22.   In the following, description will be made focusing on differences from the embodiment shown in FIG.   The recording information generation circuit 1a includes a circuit for generating recording information using a (1,7) code and
And a circuit for generating recording information based on the (2,7) code and a write clock generation circuit. It has a path 11, a laser driver 13, and a write power switching circuit 18.   The circuit for generating the recording information based on the (1,7) code is provided by a disk control described later.
A switch 31 for selecting whether or not to input recording data from the printer 4;
(1,7) code modulation circuit 101 for converting the data into a (1,7) code sequence;
A write pulse generation circuit 121 for generating a write pulse from a code string;
A switch 33 for selecting whether or not to output a pulse to the laser driver 13.
You.   The circuit for generating the recording information based on the (2, 7) code is provided by a disk control described later.
A switch 32 for selecting whether or not to input recording data from the printer 4;
(2,7) code modulation circuit 102 for converting the data into a (2,7) code sequence;
A write pulse generation circuit 122 for generating a write pulse from a code string;
A switch 34 for selecting whether to output a pulse to the laser driver 13 or not.
You.   The reproduction circuit 1b includes a preamplifier 6 for amplifying a signal from the optical head 5 and (1,
7) A circuit for reproducing the detection signal based on the code, and a circuit for reproducing the detection signal based on the (2, 7) code.
And a circuit to generate.   The circuit for reproducing the detection signal based on the (1, 7) code includes a switch 35 and a waveform shaping circuit.
Path 71, phase synchronization circuit 81, (1, 7) code demodulation circuit 91 and switch 37.
Have.   The circuit for reproducing the detection signal based on the (2,7) code includes a switch 36 and a waveform shaping circuit.
Path 72, phase synchronization circuit 82, (2,7) code demodulation circuit 92 and switch 38.
Have.   The switches 31, 33, 35 and 37 and the switches 32, 34, 36 and
38 is the same as the embodiment shown in FIG.
Drive control MPU 17 based on the identification information detected from the recording medium).
On / off control is selectively performed.   Regarding the write clock generation circuit 11 and the write pulse switching circuit 18,
Similarly, the drive control MPU 17 corresponds to the method indicated by the identification information.
Is controlled to operate.   Further, the waveform shaping circuit 71 and the phase synchronization circuit 81 use a pit edge recording method.
It is configured to operate as the MCAV method. On the other hand, the waveform shaping circuit 72 and
The phase synchronization circuit 82 operates as a CAV system in a pit position recording system.
It is configured as follows.   The drive control MPU 17 uses the pit position recording method according to the identification information to
Select a circuit compatible with the AV system or a circuit compatible with the MCAV system in the pit edge recording system.
To make the selection, a signal A and a signal B are sent to each circuit. Here, the former method
In the case of (2), a (2,7) modulation / demodulation circuit is selected, and in the latter case, a (1,7) modulation / demodulation circuit is selected.
You.   FIG. 15 shows the relationship between the recording frequency and the reproduction frequency with respect to the recording and reproduction ranges by the recording method.
FIG. 16 shows the relationship between the number of rotations and the recording / reproducing range.
Shown by system.   The pit edge recording method is approximately 1.5 times higher density than the pit position recording method
Can record. The data transfer speed is higher for high-density recording and higher for high-speed rotation.
Be faster. In order to increase the capacity and speed, the pit edge recording method
The CAV method is indispensable. CAV method with pit position recording method of ISO standard
The recording and reproduction frequency of the system and the MCAV system in the pit edge recording system are
To increase the number of rotations, it is sufficient to increase the number of rotations by the amount capable of high-density recording (about 1.5 times).
This is very advantageous in terms of speeding up. Furthermore, in order to realize large capacity and high speed,
It suffices to increase the recording / reproducing frequency and the rotation speed.   In each of the above embodiments, the pit position recording method is the CAV method,
Explains an example of making the edge recording system compatible with the MCAV system.
As described, the present invention is not limited to this.   For example, including the case of the above embodiment, at least two of the following (a) to (d)
Preferably, all the species can be reproduced and / or recorded.
it can.   (a) Pit position recording method CAV method (b) Pit edge recording method MC
AV method (c) Pit position recording method MCAV method (d) Pit edge recording
Method CAV method Of these various methods, For methods other than the ones shown, the circuit configuration, setting parameters, etc.
By making a change, it can be realized using each component of the above-described embodiment.   In the above embodiment, the pit position recording method and the pit edge recording method are used.
Although the formula has been described, the present invention provides a recording medium in which the physical form of recording is a pit.
It is not limited to what is. That is, regardless of the physical form of the recording medium,
One that records data at the position of the pot, records data at the length of the width between edges
It can be widely applied to things and the like.   The above-described embodiment is directed to an information recording / reproducing apparatus or a pit position recording type information recording / reproducing apparatus.
Operation as a data recording / reproducing device of the edge recording method has already been described.
Either a method developed or a method developed in the future may be used.   In each of the above embodiments, examples of the information recording / reproducing apparatus have been described, but these are independent devices.
Not necessarily. For example, connected to or built into an information processing device,
It may be used as an auxiliary storage device.   Next, an embodiment of a recording type converter will be described as an application example of the present invention.
You.   This is equivalent to the apparatus shown in FIG. 1 and the apparatus shown in FIG.
Is also applicable. However, rewritable recording media must be used.
Used.   First, recorded information is reproduced from the recording medium by the reproducing circuit 1b, and this is buffered.
Stored in the memory 2. Then, the information stored in the buffer memory 2 is
Then, the data is written to the original recording medium by a recording method different from that used during reproduction.   As a result, a recording type converter can be configured.   Note that reproduction and recording are performed on a track-by-track basis due to the capacity of the buffer memory 2.
It is preferable to alternate.   Although the above embodiment is an example using one information recording / reproducing device, a plurality of devices are used.
May be used.   In this case, one may be read-only and the other may be record-only. Also,
In this case, the original recording medium may not be rewritable.   In each of the above embodiments, an optical recording medium is taken as an example, but the present invention is not limited to this. Recording media that can use both the spot recording method and the width recording method
Is applicable. [The invention's effect]   As explained above, the present invention providesSpot recording method, CAV method, width
Two types of recording system, MCAV systemInformation on any combination of
Recording can be performed, and information can be recorded regardless of the recording method.
Can be played.   Therefore, according to the present invention, information recorded by different recording methods can be
It can be played back by the device, and the compatibility of the device with a wide range of recording media can be secured.
The features of the disk file device and the like can be utilized to the maximum. Also different
Information can be recorded by selecting the recording method, making it compatible with recording media such as optical disks.
Operability is also achieved, and the usability of the user can be improved.   The data transfer speed can be increased by increasing the rotation speed of the recording medium.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of a first embodiment of an information recording / reproducing apparatus according to the present invention, FIG. 2A, FIG. 2B, FIG. 3A, FIG. FIGS. 9, 9, and 12 are block diagrams each showing a part of details of components in the first embodiment, and FIG. 3B is a waveform diagram showing a read signal waveform in the pit position recording method. FIG. 3C is a waveform diagram showing the waveform of a read signal in the pit edge recording method, FIG. 3D is a waveform diagram showing the discriminating operation between the pit position recording method and the pit edge recording method, and FIG. 6, 8 and 11 are operation timing charts of the respective circuits in the above embodiment, and FIG. 13 is a configuration of an information recording / reproducing apparatus according to a second embodiment of the present invention. Showing bro FIG. 14 is a waveform diagram showing the principle of the pit position recording method and the pit edge recording method, and FIGS. 15 and 16 are recording, reproduction frequency, rotation speed and access for explaining the effects of the embodiment. It is a graph which shows the relationship of a position. 1a: Recording information generation circuit, 1b: Reproduction circuit, 1c: Control circuit, 1d: Head access control circuit, 1e: Drive control circuit, 5: Optical head, 6: Preamplifier, 7
... waveform shaping circuit, 8 ... phase synchronous circuit, 9 ... (2,7) code demodulation circuit, 10 ... (2
, 7) code modulation circuit, 11 write clock generation circuit, 12 write pulse generation circuit, 13 looser driver, 14 identification information detection circuit, 15 SCSI controller, 16 controller MPU, 17 drive control MPU, 18. Write power switching circuit.

Claims (1)

Claims 1. Media rotating means for rotating a recording medium, a reproducing head for detecting recorded information from the recording medium, one of a spot recording method and a width recording method, a CAV method, Of the recording methods composed of a combination with either one of the MCAV methods, a recording method composed of a combination of the width recording method and the MCAV method, and a spot recording method
A reproduction circuit having a function of being able to reproduce recorded information recorded by a recording method composed of a combination of a recording method and a CAV method in accordance with each of the recording methods composed of the combination; A control circuit having a selection function of selecting a recording method including the combination to be reproduced by the reproduction circuit based on the information or the identification information detected from the recording medium. An information reproducing apparatus for reproducing a detection signal according to a method selected by the control circuit. 2. Medium rotating means for rotating the recording medium, a recording head for recording information on the recording medium, and generating recording information to be written on the recording medium by one of a spot recording method and a width recording method. And a recording method consisting of a combination of the width recording method and the MCAV method, and a combination of a spot recording method and the CAV method among the recording methods consisting of a combination of any one of the CAV method and the MCAV method.
A recording information generation circuit having a function of performing the recording information generation according to each of the recording methods , and the recording information generation circuit generates the recording information based on identification information given from the outside or identification information detected from a recording medium. A control circuit having a selection function of selecting a recording method comprising the combination to be used for the recording medium. The recording information generation circuit generates the recording information to be written on the recording medium by the control circuit. Information recording apparatus, wherein the recording is performed in accordance with a method selected by a user. 3. Medium rotating means for rotating a recording medium, a recording / reproducing head for recording / reproducing information on / from a recording medium, and a spot recording method. And the width recording method and the width recording method and the MAV method. Recording method and spot recording in combination with CAV method
For method and recorded information recorded by the recording method comprising a combination of a CAV system, a reproducing circuit having a function capable of reproducing in response to the recording system each consisting of the combination, the recording information to be written on a recording medium Is generated from the combination of the width recording method and the MCAV method among the recording methods composed of a combination of the spot recording method and the width recording method, and one of the CAV method and the MCAV method. Recording method and the combination of spot recording method and CAV method
A recording information generation circuit having a function to perform in accordance with each of the recording methods , and the combination to be reproduced by the reproduction circuit based on identification information given from the outside or identification information detected from a recording medium. A control circuit having a selection function of selecting a recording method including the combination of the recording method and the recording information generation circuit to be used for generating the recording information, wherein the reproduction circuit detects a detection signal from the reproduction head, The reproduction is performed according to the method selected by the control circuit, and the recording information generation circuit generates the recording information to be written to the recording medium according to the method selected by the control circuit. Information recording / reproducing device. 4. The reproducing circuit detects the leading edge and the trailing edge of the signal pulse read from the recording medium, and if the width recording method is selected, uses the leading edge and the trailing edge to set the spot recording method. 2. The information reproducing apparatus according to claim 1, further comprising a function of reproducing data by using one of a leading edge and a trailing edge when the information is selected. / Reproducing device. 5. A function of temporarily storing data reproduced by a reproducing circuit, and then converting the data into recording information of a recording method different from that used during reproduction by the recording information generating circuit. Information recording / reproducing device.